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Anyone with Barnard P-Cheytac action, I need some info,

I understand it has action dia of 1.53" and 3 lug bolt, and

I need a picture of the bolt face...Ed
 

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Just curious if the powder manufacturers help you guys in blending special mixes, or are you just using what is available off the shelf.

I really enjoy reading your posts....those are some serious cartridges. :p
 

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The right powders are out there, lot of guys just got to get them..,

He just got to use more of a slower powder,

I got whole bunch slower than HBMG, I test with.
 

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585 Hubel Express video, 190ft/lbs recoil, heavy load, gun little light.....



Another view of Asteroid Precision's.... 375 HE target gun,




Here is our 416 HSM we are developing next to 416 Barrett, Ed

 

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We might have a company that is doing a bolt gun with an action

between BMG size and longer rifle actions used for 375 HE,

375 Lethal, and Cheytacs.. To use for our 416 HSM without

having to do extreme rebating of the rim...Ed
 

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Here is picture of 620 416 hsm cases half done. Done on cnc ,

that slimmed them down, cut new rim and extractor groove.

There are over 500 more at cnc getting done now, plus we have

1000s more bmg cases we make them from, when needed..

This case is public domain and if anyone wants to make

them we can give the steps involved...Ed.

 

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For big long cases our testing is showing that the 416 is

easier to get powders to work with, with less problems ..

So if you got to buy new barrel, build a target gun, just go

with 416, we got cases, 416 HE and 416 HSM...

CEB and others will have bullets...

CEB will be making .408 and .416 Lazers

.408 ---- 425gr, 450gr and 475gr

.416 ------ 450gr, 475gr, 500gr, 525gr and 550gr

They will be testing around mid-February..

My bigger diameter, 34" long 416 test barrel, was 250 bucks,

1-10 twist, 1- 5/8 inch diameter, work for bullets, 425-450gr or so..;Ed..
 

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For big long cases our testing is showing that the 416 easier to get powders to work with, less problems ..
Maybe building a target gun,don't have 375 barrel all ready, maybe go 416.

Got sent 5 thick sided sample cases, same OD base as 585/375.416 cases, same belt, just .180" longer,
did a 416 HE, chambered extra barrel , cases stick over 50k. They have about .042" total taper, .021" per
side, when I necked couple to 416. That is a lot of taper , twice the taper of my 416HE...hanging up at 50k..

I could maybe go to 65k with these if we made taper with ..012" - .016" more taper to each side, but that is
no way to build target cases. I'd have to crunch down case shoulder diameter. And would look like 30-30.

And crazy part is, the case has enough brass material to thin up sides and stretch them way out to 4 or
more inches,, They weigh 150 gr more than our 585/375/416,, but with real thick sides they actually
hold less than our 416 HE with thin sides, that is .180" shorter...Our case does 65k ok without sticking..

And we can make super long 4" cases work if we had means to get them built, as we have
15 powders slower than HBMG.Here is pic of thin and thick sided cases, sectioned for comparison.Ed..


 

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Here is a drawing depicting the layoutof thick and thin sided cases,

like my 585/375/416 HE thin sides ones and the thick one.

And my 585 case is not perfect, as where it transitions from the

heavier corner to the side it isn't gradual, so case separates there

shortening case life. There are others made that way including brand X.

The dotted line is what it should be. ..Ed

 

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Others have sent cases to section and look at, that are built thick sided and they stick also for the folks,
If a longer case with about 5 sq in of side surface sticks and don't spring back, the coefficient
of friction is about .01 then the pull needed to move it is 2500-3500 lbs..That is for big
cases with normal amount of slant to the sides. Ed.
 

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Here is picture of six nyati and gibbs size cases sectioned..



In the picture the nyati gma is one we built most of our first 585s on. Before we had factory run.
Reworking made it in size that is my 585 HE, but but that brass had the sides of perfect thickness,
not too thick, but thin without sharp transition my new factory 585s had, they last forever as 585s......

Fourth one is an older nyati case I used to make about 10 of my 585s from ...they had thin sides
and sharp transition, and then I tested these 20 years ago, and they would separate after -4-6 hot loads
as 585s, my factory 585 with right powders as a 585 will get 10 hot loads, and necked down to
416/375 4- 6 hot loads, right powders used, Moderate 577 equivalent, factory 585 at least 20 loads..Ed.
 

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Guy sent thick sided 375 case, next size base diameter up from Nyati.He said,
'Yes I ran them in a ___________ rifle built by ____, the best I
could get was 44000 psi, any more and they were stuck''

Big bore guys. other forums over the years related that trex/african case in 585
size, thick sided cases, stuck when they loaded them over 45k psi.

Another just sent us, thick sided 375, long case, same base OD as our 585 HE,
416 HE, 375 HE, and Mitch's 375 Lethal, and the thick ones stuck over 45k psi.

Now you can fill those cases up, with ultra slow enough powder so they won't
stick, but powder is too slow for max speed. Might get a little more
speed, with thick sides case, but case got to be 4- 4.5 inches long..

. Anyone needing a sectioned case of the ones I made the first of my 585s from,
contact me, if they want to get a general idea of what case side thickness should
be, in Gibbs size cases on up to about trex and 375 VM size case diameter.

Here is pic of our 585 based case next to brand X and thick ones, both have
same sharp, thinner, corner, where transition from heavy angled corner, to the
side, the carbide draw rod could easily be reshaped with diamond wheel,
just by grinding off sharp transition corner. Then sides would be perfect.., .




Here is picture of 416 HE in a Choate target/varmint stock guy is doing,

with a long BSA, U9 action...Ed

 

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Picture of 416. Ed


Here is picture of 416 HE in a Choate target/varmint stock guy is doing,
using long action BSA U9 action.Action setting in stock ready to bed..Ed

 

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Here is picture of thick 375 case sent to me, with thick sided trex case, and our HE case,
The thick 375 case is .050" bigger OD base, but inside is no bigger than HE cases..
These thick sided 375s stuck when loaded over 44,000 psi....



Got guys asking and I'm doing it, to do my 416 HSM case for BMG actions, so leaving rim same,
as the original bmg rim, so will neck them, fire form to the longer shoulder, like the others.
Base a little bigger, Shoulder same diameter, same 30 degree slant, neck will be same..

The inside of case still has close to same shape and volumne within 3 % as the ones we slimmed down.
Some want to use bmg actions and can't wait for intermediate actions, or already have bmg action.
And they are really getting interested in the complete line of 416 CEB bullets now being done..Ed
 

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There will be 3 versions OF 416 HSM, one for actions one .750" bolt, one for .800-.850" bolt,
And one for bigger bmg bolts. The ones for BMG called 416 HSM2 ..

Here is 416 HSM guy working in a Montana PH, in a heavy thumbhole target stock.
It has a .805" diameter bolt... Ed


 

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Here is sectioned 585 HE case in the middle, we first made from

another case, years ago before we had factory run of brass and

it had perfect thickness on the sides and inside corrner.

We could fire them many times without sides thinning..

First case is factory run of our 585 HE, 3rd is case that is too thick

of sides and sticks at high pressures..



Here is pic of our factory run cases necked down to 375 and fired 4 times

at high pressure on the right, with unfired case on the left. Our case is not

perfect but does work...Ed

 
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